Brake operating mechanism



March 19, `19.4() w. R. MILLICAN Er AL BRAKE GPERATING MECHANISM Filed April 9. 1937 Patented Mar. 19, 1940 n. K. y a i I UNITED STATESg PATENT oFl-lce Word R. Millican and Roy E. Millican, Mesquite,

1 Tex.

Application April 9193'1, serial No. 135,897

1o claims. (o1. 19e-s) This invention relates to new and useful imfrom a reading of thefollowing speciiication and provements in rbrake operating mechanism. by reference to the accompanying drawing, in

One object of the invention is to provide imwhich an example jof the invention is shown, proved means for operating the brake of a veand wherein: l

hicle, whereby the operator may control the ap- Figure 1 is a longitudinal sectional view of a k5v plication of the brake with minimum effort and braking mechanism', constructed in accordance inconvenience to him. with the invention, and showing the position of An important object of the invention is to the parts with the brake released, and f provide an improved brake operating mechanism Figure 2 isla `similar view of the hydraulic 10- wherein the power of theengi'n'e `of a vehicle is' control valve and its connection with .the foot 10 utilized to apply the brake of said vehicle, whereaccelerator with rthe brake applied. f by no eiTort on the part of the operator is re- In the drawing, the numeral It designates the quired. master cylinder of a hydraulic braking system,

Another object of the invention is to provide such as is in common use on motor vehicles.

an improved mechanism for .operating the brake The cylinderghas piston il movable therein 15 of a motory vehicle whichfis constructed so that andra` coiled spring l2 eXelS its pres-SUIS 'G0 hOld the brake is applied bythe power of its motor the piston toward one endof the cylinder (Figof the vehicle, withmeans for controlling-the ure 1,) and When-'in such position, the brake of application of such power to the -brake by the the vehicle is released. Movement of the piston usual foot accelerator of the vehicle, whereby to the position shown in dotted lines in Figure 1 20 the brake pedal, together with-its inconvenience, forces hydraulic brake fluid to the wheels ofthe is entirelyeliminated. l v vehicle to applyA the brake.y `The aboveis `of Still another object of the invention is to prothe usual construction and forms no part of the Vide an improved brake operating mechanism present invention and is, therefore, subject to g5 having mechanical means for applying the brake variation, having been described merelyy for the 2K5 and having hydraulic meansfor controlling the sake of clarity. l y l application of power to the lbrake by the me- For imparting movement to the brake piston chanical means, whereby smoothness of opera- Il t0 apply the brake. a movable operating rod tion is had; the hydraulicy system being supplied orstem i3 has one end engaging a recess I3 in 3ol with huid from the crank ease of the vehicle, the end 0fy the piston. Manifestly, a movement 3owhereby an auxiliary fluid supply is not necesof the stem or rod- I`3 inwardly 0f the Cylinder sary. l I0 will impart a movement to the brake piston A still further object of the invention is to undertension of the spring l2. A movement of provide an improved mechanism of the character the rod in an opposite direction will permit the e; described wherein the hydraulic means which sprnelZ t0 returnthe piston toits orenalposi- 35 controls the` mechanical means isoperated by the 171011 t0y release the brake .O'f the vehiCle. f oot accelerator of the motor vehicle; the ac- For actuating the rod or stem IB'from the mo^ celerator being so constructed that its movement tor or engine of the-vehiclel (not shown), agear includes a braking range and a fuel supply range, assembly is provided. This assembly includes a `40A the former being at one end of the accelerator rotatable driven shaft I4 which has a pulley l5 40 movement with the-fuel range ,during the resecured tol onefend thereof.y This pulley is conmainder of the movement, whereby it is imposnected by a belt 'I6 with the drive shaft (not sible to apply the brake while fuel is being supshown) or other moving part of thefmotor of plied or vice lversa. the vehicle, whereby the shaft lll is rotated when Another object of the invention-is to provide said `motor is operated. The vshaft is suitably' 45 an improved bra-king mechanism which is conjournaled in bearing collars or brackets Il which trolled directly in accordance with the position are provided with ball bearings i8 to facilitate o-f the accelel'atorwhereby `the braking may be rotation of said shaft. y

positively controlled .with the mechanism, eXact- The end of the shaft extends through a rotatl ly as with `the usual brake pedal ordinarily proable, cylindricall housing I9 through an axial 50 vided. opening 2 in the end wall thereof. The hous- A construction designed toy carry out thev ining has its opposite open end closed by a` cap vention will be hereinafter described, together member 2| which is threadedthereinto and the with other features of the invention. cap is formed with an .axial opening which is The invention will be more Ireadily understoodv surrounded by a collar 22. yThe end of the shaft 55 projects a slight distance from the collar and a suitable ball bearing assembly 23 is interposed between the shaft and collar, whereby the end of the shaft is rotatably supported in this end of the housing.

A drive gear 24 surrounds the shaft adjacent the opening 2S in the end wall of the housing and has a collar 25, preferably made integral with the gear, which is screwed into the opening 2G, whereby the gear is affixed to the housing. A suitable bearing assembly 26 is interposed between the gear 24 and shaft Ed, whereby rotation of the shaft within the gear is facilitated. Obviously, with the above construction, the shaft i4 may rotate within the housing 59 without imparting rotation thereto.

For effecting a driving connection between the shaft I4 and the housing I9 so as to impart rotation to the drive gear 24, that portion of the shaft within the housing is enlarged as shown at 2. A clutch disk or plate 28 is keyed on this enlarged portion of the shaft whereby said disk rotates with the shaft. To connect this rotating disk with the housing I9, a second clutch plate or disk 29 is mounted to slide on the enlarged portion of the shaft being located adjacent the disk 23. The disk 29 is formed with a plurality of recesses 3l in its outer surface and the inner ends of laterally directed pins 3l are secured in said recesses. Each pin extends outwardly through an opening 32 in the cap 2 I, being slidable therethrough and has its extreme outer ends threaded into a lug 33 which is formed near the inner end of an arm 34. Each arm is pivoted at 35 to an ear 3@ which is formed on the outer end of the collar 22 or the cap 2i. By moving the arms 34 inwardly toward each other, the pins 3I will be pulled outwardly from the housing I9, whereby the plate 29 is moved against the cap. When the arms 34 are expanded or moved away from each other, as will be hereinafter explained, the pins 3i are moved inwardly of the housing I9 to slide the plate 29 on the shaft I4, so as to engage said plate with the clutch plate 28 which is keyed on said shaft. When the clutch disks 28 and 29 engage each other, and the shaft I4 is rotating, the frictional engagement therebetween will cause the disk 2B to impart rotation to the disk 29. Since this latter disk has connection with the housing i9 through the pins SI, the housing rotated therewith. Rotation of the housing will, of course, rotate the drive gear 24.

The gear 24 is in constant mesh with an enlarged gear 38 which is riveted, or otherwise secured to an annular flange 39 formed on an elongate sleeve 4Q. The sleeve is mounted to rotate in a suitable support 4I which may be fastended on the motor block (not shown) of the vehicle. Suitable ball bearings 42' are disposed in the support adjacent the flange 39 of the sleeve to permit easy rotation thereof when the gear is rotated.

The bore 4E of the sleeve 40 receives the outer of the operating rod or stem i3 which enthe brake piston II of the master cylinder IE. The rod is formed with threads 43 providing a screw which has threaded engagement with the bore. The extreme outer end of the rod extends from the bore of thev sleeve through a bearing collar 44 which is mounted in a iixed position on the vehicle motor or frame, or other support. A key 45 in the stationary collar engages a longitudinal keyway or recess 46 in the periphery of the rod I3 and permits a sliding Athe brake.

`with relation to the sleeve.

movement of the rod, while preventing rotation thereof.

From the above it will be seen that when the drive gear 24 drives the gear 38, the sleeve 4U is rotated. Due to the threaded engagement between the bore of the sleeve and the threads 43 of the rod I3, said rod will be moved with relation to the sleeve. The rod cannot rotate because of the key 45 and through the screw jack action the rod is moved so as to move the brake piston il under compression of the spring I2 to apply When the brake iS completely applied, the clutch plates 28 and 29 will slip, which prevents damage to the mechanism.

The shaft I4, as has been explained, is connected by the belt IE and pulley I5 with the drive shaft. fan shaft, or other moving part of the motor and therefore, always rotates in only one direction. Thus, when it is desired to release the brake, the control arms 34 are swung inwardly to disengage the clutch plates 28 and 29. This prevents further rotation of the drive gear 24, gear 38 and sleeve 40. However, the rod I3 has been moved within the cylinder IU by the screw jack action of the sleeve on its threads. To return the rod to its original position and permit the release of the brake of the vehicle, it is necessary that the sleeve 4B be rotated in a reverse direction.

For eecting this reverse rotation of the sleeve 4G when the clutch plates 23 and 29 are separated, a at spring 41 surrounds the sleeve and cenned in a casing 48 which is secured to the support 4I, whereby said casing is stationary One end of the spring is secured to the casing at 48 while its other end is secured to the sleeve at 49. Therefore, when the sleeve 4D is rotated by the gear 38 to apply the brake, as has been explained, the spring 4'! is wound so as to be under tension when the rod I3 has applied the brake. When the clutch plates or disks 28 and 29 are disengaged to disconnect the shaft I4 from the housing I9, gears 24 and 38 and sleeve 40, the spring automatically unwinds and in unwinding, imparts a reverse rotation to the sleeve. This reverse rotation of the sleeve retracts the rod I3 within said sleeve and permits the coiled spring I2 to return the piston l! to its brake releasing position, as shown in full lines in Figure 1.

Obviously, the force exerted against the piston I l in applying the vehicle brake is obtained from the motor of said vehicle for the sleeve 40 is rotated through its connection with the shaft I4. Therefore, no energy on the part of the operator need be exerted in applying said brake. The position of the pivoted control arms 34 which are carried by the collar positively controls the position of the clutch plate 29 with relation to the plate 28, whereby said arms control the rotation of the sleeve which results in application of the vehicle brake.

Any suitable means may be employed for spreading and retracting the control arms 34 but it is preferable to employ the structure shown in Figure 1. A conical expanding head 5i) is located in axial alinernent with the housing I9 and is movable axially with relation thereto. This head is rotatably mounted on ball bearings E! on the outer end of a piston rod 52 which is slidably supported in a cylinder 54. A piston 53 is secured to the rod within the cylinder and is movable therein, whereby movement may be imparted to the rod. The outer end of the head is closed by a cap member 50'.

hicle brake, as has been explained. An intro-y 2,194,198 The head 50, is substantially conical being c gradually reduced toward its outer end. The inner end of the head is formed with an annular recess or curved shoulder 55 on its outer periphery. Since the head is located axially of the housing I9, the outer ends of the control arms 34 are arranged to engage the outer surface thereof. These outer ends of said arms have rollers 34 mounted therein, which rollers facilitate movement of the head with relation to the arms. The arms are at all times engaging the head and manifestly, when the head is moved toward the housing I9 from the position shown in Figure 1, the outer ends of said arms riding the inclined surface of the head, are swung outwardly or expanded which moves the clutch disk or plate 29 into engagement with the plate 28, as hereinbefore stated.

As `the head movesfurther between the arms 34, the plates 23 and 29 are engaged and the housing I9 begins to rotate with the shaft I4. The amount of frictional contact between the Clutch plates is determined by the position of the head for manifestly, as the head increases the expansion of the arms, the frictional grip between the plates is increased, which increases the application of the brake in accordance therewith. The arms 34 secured to the housing I9 rotate therewith and their frictional engagement with the head 59 imparts a rotation to said head, which easily revolves on the piston'rod 52. This structure eliminates a drag or frictional resistance to the rotation of the housing I9. When the piston 53 is moved, the head 59 is retracted from between the arms 34 and said arms may swing inwardly to disengage the clutch plates 28 and 29 and release the brake. i

Any suitable means may be employed for imparting a movement to the piston 53 within the cylinder 54, whereby the head 50 may be moved with relation to the arms 34 toswing the same. However, it is preferable to operate the piston 53 by fluid pressure whereby a smooth and even actuation thereof is effected. For this purpose.

a pressure fluid supply line 5B is connected to one end of the cylinder 54, while a second pressure fluid line 5'! is connected to the opposite side of said cylinder. Manifestly, the introduction of a pressure fluid through the line 56 will move the piston to the position shown in Figure 1, whereby the head 59 is retracted from between the arms 34 which permits disengagement of the clutch plates 28 and 29 and causes a release of the veduction of fluid through the line 5'Iv will of course move the piston 53 in an opposite direction to cause the head 59 to expand said arms, engaging the clutch plates 2B and 29 and causing an appli-. cation of the brake through the movement of the operating rod I3.

For controlling' the admission of pressure fluid to the lines 56 and 5l to control the movement of the piston 53 a control valve assemblyis provided. This valve comprises a cylindrical housing 5I which is preferably made integral with the end of the cylinder 54. As clearly shown in Figure l the housing 5I may be secured by bolts 59 to the cylinder 54. The piston rod 52 extends completely through the piston 53 and this extended end 52' extends into a longitudinal bore (53 which is formed in the housing 5I.

The pressure fluid line 55 leading from the Cylinder has its other end connected in the housing 9i so asl to communicate with the bore 63, while the other end of thefluid line 5l is similarly connected in said housing. Thus, both lines 56 and 5l have communication with the bore 63 of the housing. A supply line or tube 64 hasl its lower 4end leading from the bore 63, being connected at a point between the lines 56 and 51. The other end of the line 64 is connected to a storage chamber 55 which is supplied with fluid under pressure by a pipe $6 which leads fromxthe usual oil pump (not shown) of the motor vehicle.

Obviously, the iiuid under pressure flows fromV the supply line 54 into the bore 63 from where it flows to the lines 56 and 5l to operate th piston 53 in a desired direction.

For conducting the fluid to either one or the other of the lines 55 and 5l in order to move the piston 53, a sleeve 6'I is mounted to undergo l movement within the bore 63 of the housing. The sleeve is open at each end and is formed v with a plurality of collars 68 which are preferably integral therewith and which are spaced throughout the length of the sleeve. The collars have a diameter substantially equal to the diameter of the bore so as to have a snug sliding iit within said bore.r The provision of the collars spaces the surface of the sleeve from the wall of the bore 53 lwhereby a trio of annular channels 69, v

7i] and ll areI formed between the sleeve and bere. The inner end of the sleeve is connected by a radial pin 'I2 with the extended end 52 of the piston rod 52 so that when the piston 53v and the rod 52 are moved, the sleeve 5l is moved within the bore.

With the brake applied and the piston 53 in the position shown in Figure 2, the end of the annular channel 69 is beneath the line 5 1, the

annular channel l5, then into the bore of the sleeve 61, from which it flows to one or the other of the channels 69 or Il to supply either the line 55 o-r the line 57.

For controlling the flow of fluid from the central channel 79 to the other channels, a sliding valve member 'I3 is mounted within the sleeve.

This member includes an actuating stem 'I4 which projects through a stuffing box 'I5 at the outer end of the bore 53. A pair of circular heads 'I6 are mounted on the stem in spaced relation and have a sliding fit within the sleeve 61, and the space between the heads is equal to the distance between the ports 69a and lla. When the brake is applied, the parts are in the-position shown in Figure' 2, with the inner head 'I6 of the valve member beyond the ports 69a and the other head positioned between the ports 'ma and lla of the channels 'Iii and 'll respectively. At this time the pressure fluid from the supply lline S4 flows into the central annular channel 'I9, through the ports 79a. and into the bore of the sleeve B1. From the bore, the fluid flows through the ports 69a. channel 99 and into the fluid line 51 which cek conducts it to the end of the cylinder 54 to hold been moved within the operating arms Sli to expand the and cause the clutch disk 29 to engage the clutch disk 28.

is the piston 53 has moved to the position shown in Figure 2, the iluid from the other side piston has drained through the line 56, l! into the interior of the sleeve 6l', from i er: it ows from the open end thereof he re of the housing. From the bore, ses through an opening 'il which communicates with a longitudinal drain passage "r3 formed in the housing. A suitable return line lr? is connected to the passage to return the iiuid source of supply. It is noted that if a leak occur at this time in the line 5'? or in .nder 54. and the duid escaped therefrom, al vduid is supplied to the line 5l' since the communication. between the supply line fl `e line 5l is held open at all times.

n is desired to release the brake and move the piston. 53 to its opposite position or that shown, in Figure l, the valve member i3 is nic-ved within the sleeve to move its inner head away from the piston. rod 52'. Movement of the valve member causes the heads 'i6 to move into position shown in dotted lines in Figure i? with the inner head in alinement with the ts Ella although not completely covering the saine. The other head has moved to the outer end of the sleeve and therefore, a communication is established between the ports 'lila and the ports liawhereby the pressure fluid may flow from the supply line Ell to the line 56. At the time, the ports @Se leading from the line 5': communication with the bore F53 to the open end of the sleeve El, thereby permitting iiuid to drain from the line 5T into the bore 63 and then through an opening 88 which leads to the drain passage T8. As the pressure fluid is conducted to the cylinder 54 through the line 56, the piston is moved from the position shown in Figure 2 to the position shown in Figure l. As this occurs, the sleeve 57 is moved outwardly in the bore S3 because of its connection to the pin "S2 with the piston rod 52'. This movement of the sleeve causes the parts to assume the position shown in Figure 1, with the ports 69m and 'los completely uncovered and the ports 'lla partially covered by the outer head of the valve member. The communication between the line Gil and the line 55 has been maintained and is maintained so long as the vehicle brake is released. Therefore, the pressure is always held on the piston 53 when the brake is released and danger or" leaks causing unintended application of the brake is obviated. To apply the brake, the valve member is moved inwardly to again establish communication between the .line Ed and the line 311. while the line E-i is permitted to drain, as has been explained.

From the above, it will be seen that the piston 23 may be moved from complete brake releasing position to complete brake applying position by the valve member I3 from one extreme position to the other within the bore of the sleeve. There are many instances where the brake is only partially applied and therefore, the valve member and sleeve Gl are so arranged that the5 may be stopped in any of their intermediate positions, and. the amount of pressure applied to the brake is dependent upon the position of the parts within the bore. Assuming the parts to in brake releasing position as shown in Figure l and supposing that it is only necessary to apply the brake partially, then the member Chih( 13 is moved lonly a part of the distance through the bore of the sleeve so that said valve member travels forwardly (to the left Figure l) within the sleeve, whereby the outer head 16 thereof uncovers a portion of the port 69a and establishes communication between the supply line G4 and line 5?. For example, it will be assumed a one eighth inch area of the port 69a is uncovered which restricts the ilow of fluid through the line 5?. Since the heads 'i6 are spaced the same distance apart on the member as the ports 69a and 750, in the sleeve, uncovering of one eighth inch oi the port 59a to permit flow into the line 5l causes a similar uncovering of the port la to permit an exhaust of the fluid from the piston cylinder through the line 55.

As the iiuid flows into the line 5l the piston 53 is moved which imparts a movement to the sleeve S7. rl`his movement of the piston and sleeve continues until the ports 69a and 'Ha move into alinement with the heads 76, which cuts 01T the flow of fluid through the lines 56 and 5l and halts the piston in its intermediate position, where said piston remains until the valve member i3 is again moved. Therefore, it is evident that any amount of pressure may be applied to the brake piston 53 by properly manipulating the valve member The piston 53 may be halted in any intermediate position hetween its limits of movement and therefore, the same control of the braking may be had as with the usual brake pedal.

Any suitable means may be employed to actuate the valve member "i3, but it is preferable that it be controlled by the usual foot accelerator pedal Si of the vehicle, in which case the usual brake pedal may be eliminated. As shown in Figure 2, the underside of the accelerator pedal contacts the upper end of a rod 32 and the lower id of this rod is pivoted to an arm 83. which arm is secured on a rotatable shaft 2li. One end of the shaft has an upwardly extending arm 85 fastened thereon and this arm is pivoted to' one end of a rod SB. The other end of the rod S6 telescopes a sleeve Sl which is connected with the fuel throttle on the motor (not shown). A nut 88 is secured on the rod 36 at a predeterined point and is arranged to engage the end of the sleeve 8i' to impart movement thereto. Obviously when the nut is in the position shown in dotted lines in Figure 2 and spaced from the end of the sleeve it may undergo a limited movement with relation to the sleeve.

The other end of the rotatable shaft 8f has a depending lever Sii secured thereto and the lower end of the lever is pivoted to the outer end of an operating rod 90 which has its other end secured to a housing 9|. The outer end of the stem 'iii of the valve member extends into the housing and has a collar Q2 thereon. A coiled spring S3 is interposed between the collar and the end wall of the housing and when there is no resistance to the movement of the stem lll, the spring connects the stem and the operating rod 9? to cause them to move as a unit however, the stem and rod may move with relation to each other under tension of said spring,

With the brake released, the arm and lever 89 are in the position shown in dotted lines in Figure 2 with the nut B8 spaced from the end of the sleeve 8l. As the pedal 8i is depressed, the shaft @Il is rotated in a counter-clockwise direction swinging the lever B9 which moves the valve member 'J3 through the rod il@ and stem ifi. While the member is being moved the rod 86 isl telescoping rthe s'leevebutno movement yis imparted to said sleeve because the nut 88 4is not in engagement with the end thereof. Of course, as soon as said nut engages the sleeve '81, the fuel'throttle is actuated and by this time the valve member 'I3 has completed its movement,

- With such arrangement, the pedaly 8| has a braking range and a fuel supply range and it is impossible to apply the brake while increasing the fuel supply. The movement of the' I pedal throughtheubraking 'range is relatively small and no1 leifortor exertion on the part of the operator is necessary. The usual brake pedal is entirely eliminated and the starting and stopping of the vehicle is consolidated in one control. Since the brake is automatically applied when the accelerator pedal is released, the danger of the operator leaving the vehicle without setting the brake is obviated.

Attention is directed to the annular shoulder 55 which is formed on the head or cone 58 at the inner end of said cone. It is obviousthat the shoulder is of less diameter than the end of the inclined surface of said cone and therefore, when the rollers 34 of the arms 34 rest on the shoulder they are not expanded as far as if they were engaging the extremity of the inclined surface of the cone. Thus, the brake is not completely applied when the rollers are on the shoulder 'but is only partially applied. The purpose of this shoulder is to prevent a complete application of the brake in the event that the accelerator pedal 3l should be accidentally' released while operating the vehicle. In the event'that this should occur, the piston 53 would immediately move to the position shown in Figure 2 and the head 50 would be moved within the arms Sii so that the rollers 34 ride off of the inclined surface of the head onto the shoulder 55. Therefore,.the accidental release of the pedal 8l would only partially apply the brake whereby the vehicle would come 'to a gradual stop instead of to a sudden stop, as would be the case if the rollers only moved to the largest diameter of the cone surface.

What we claim and desire to secure by Letters Patent is:

l. A brake operating mechanism for a motor vehicle including, a member for actuating the operating means of the vehicle brake, means for connecting said member to the drive mechanism of the vehicle, whereby the force necessary to actuate the vehicle brake is derived from the motor thereof, and fluid pressure means for. controlling the drive connection between said member and the motor, whereby the application lof the brake is controlled. v

2. A brake operating mechanism for a motor vehicle including, av member for actuating the operating means of the vehicle brake, means for connecting said member to the drive mechanism of the vehicle, whereby the force necessary to actuate the vehicle brake is derived from the motor thereof, iiuid pressure means for controlling the drive connection between said member and the motor, whereby the application of the brake is controlled, and a manually controlled valve. as-

sembly for effecting the operation ofthe fluid pressure means. f

3. A brake operating mechanism for a motor Vehicle including, amember for actuating the yoperating means of the vehicle brake, means for connecting said member to the drive mechanism ofthe. vehicle, whereby the force necessary to actuate the vehicle brake is derived from the motor thereof, iluidpressure means for controlling they drive connection between said member and the motor, whereby the application of the lbrake is controlled, and a valve assembly for y means for controlling the connection and disconnection of the assembly with the member, and means independent' of the gear assembly for moving said member in an opposite direction to permit release of the brake.

5. A brake operating mechanism for a motor vehicle including, a movable member for actuating the operating means of the vehicle brake, a gear assembly driven by the motor of the vehicle and connected with said member for moving the member in one direction to apply the brake of the vehicle, fluid pressure operated means for controlling the. connection and disconnection of the vassembly with the member, means for controlling the actuation of the' pressure operated means by the fuel control lever of the-motor of said vehicle, and means independent of the gear assembly for moving said member in an opposite direction to permit release of the brake.

6. A brake operating mechanism for a motor' vehicle including, an actuator for actuating the brake operating means of the vehicle, a drive brake operating means of the vehicle, a drive shaft connected with the drive mechanism of the vehicle and rotated thereby, a gear assembly for connecting the drive shaft to the actuator to move the latter in a direction to apply the brake, a clutch between the assembly and drive shaft for controlling the connection therebetween to control the application of the vehicle brake, and pressure iluid operated means for operating the clutch.

8. A brake operating mechanism for a motor vehicle including, an actuator for actuating the brake operating means of the vehicle,`a drive shaft connected with the drive mechanism of the vehicle and rotatedthereby, a gear assembly for connecting the drive shaft to the actuator to move the latter in a direction toapply the brake, a clutch between the assembly and drive shaft for controlling. the connection therebetween to control the application of the vehicle brake, and pressure uid operated means for operating the clutch, said last named means being controlled in its operation by the fuel control of the vehicle.

9. A brake operating mechanism for a. motor vehicle including, an actuator for actuating the brake operating means of the vehicle, a drive shaft connected with the drive mechanism of the vehicle and rotated thereby, a gear assembly for connecting the drive shaft to the actuator to move the latter in a direction to apply the brake, a clutch between the assembly and drive shaft for controlling the connection therebetween to control the application of the vehicle brake, pressure fluid operated means for operating the clutch and a valve assembly for controlling the supply of fluid to the fluid pressure operated means, whereby the application of the vehicle brake is controlled by said valve assembly.

l0. A brake operating mechanism for a motor vehicle including, an actuator for actuating the brake operating means of the vehicle, a drive shaft connected with the drive mechanism of the vehicle and rotated thereby, a gear assembly for connecting the drive shaft to the actuator to move the latter in a direction to apply the brake, a clutch between the assembly and drive shaft for controlling the connection therebetween to control the application of the Vehicle brake, pressure fluid operated means for operating the clutch, a valve assembly for controlling the supply of fluid to the fluid pressure operated means, whereby the application of the vehicle brake is controlled by said valve assembly, and means for connecting the valve assembly directly to the foot accelerator of the vehicle whereby the application of the brake of the vehicle is controlled by said accelerator.

WORD R. MILLICAN. ROY E. MILLICAN. 

